Portable boring-machine.



1. J; BROSNAN. PORTABLE BORING MACHINE. APPLICATION FILED SEPT- 21. 1917.

1,272,370. Patented July 16, 1918.

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JOHN J. BROSNAN, OF WORCESTER, MASSACHUSETTS.

PORTABLE BORING-MACHINE.

Specification of Letters Patent.

Patented July 1c, 1918.

Application filed. September 21, 1917. Serial No. 192,445.

To all whom it may concern: I

Be it known that 1, JOHN J. BROSNAN,

a subject of the.King of Great Britain, residing at l Vorcester, in the county of Vorcester and State of Massachusetts, have invented a new and useful Portable Boring-Machine, of which the following is a specification.

This invention relates to a portable machine for boring holes in floors for piping and the like, particularly holes near a vertical wall.

The principal objects of the invention are to provide'a convenient form of supporting frame, having a foot-rest at the bottom by which it can-be held down firmly on the fioor by the foot of the operator, and at the same time to provide this device with means for operating the auger shaft by hand from any side thereof by'means of multiplying'gean ing. The invention involves specially the employment of a casing or support carried bythe shaft, and adapted to be held manually in any stationary position while the shaft is being rotated, and carrying the multiplying gearing for operating the shaft. Further objects and advantages of the invention will appear hereinafter.

Reference is to be had to the ing drawings, in which- Figure 1 is a front elevation of a floor auger constructed in accordance with this invention;

Fig. 2 is a central sectional view of the same;

Fig. 3 is an inside view of gearing casing with the front cover removed, and

Fig. dis a sectional view on the line 1-4 of Fig, 1', showing the supporting frame in lan.

p The frame is in the form of a standard 10 having a flat plate 11 integrally provided thereon at the bottom, and constituting a foot-rest on which the foot of the operator is placed to hold the frame in fixed position. This frame is provided with guides 12 separated from each other but located near the top for the auger shaft 13. This is provided with the usual means near the bottom for holding the auger 14. At the top the upper guide 12 is provided with a split-nut consisting of two parts 15 and 16,.each one pivoted to the top of the guide 12 and each having a half or nearly half screw thread fitting the screw on the auger shaft. A pivoted release accompanynut 17 is provided for holding the two parts of the split nut together while the device is in operation. The frame 10 preferably is made in two pieces held together bybolts 19.

The shaft 13 extends well above the split nut'and is provided at its top with a relatively fixed hub 20 having a member 21 I meshing with a gear 26 on a shaft 27. This shaft is provided with a gear 28, meshing with a pinion 29on a shaft 30, to which the operating handle 31 is fixed. These shafts are all supported by the casing. By this gearing it will be seen that a relatively slow motion of the tool is secured, for driving it in most diflicu-lt places and securing a sufficient amount of power.

It will be observed that the casing 2 1 is not fixed to anything but is simply supported by the shaft which the gearing inside it is designed to drive. For this reason I provide on the casing a fixed handle 32 which is designed to be held by the left hand of the operator to hold the casing against turning and transmit pressure from the handle 32 to the screw through the ball bearing. This I find a very convenient way for securing the desired power without complicating the machinery, and without provid ing an expensive arrangement especially of the lower frame.

I have found in practice that this is an extremely efficient tool and that this efficiency is secured very largely by the provision of the casing at the top of the screw or shaft containing the means for operating the shaft with an increase of power.

This is especially advantageous over the old-fashioned floor augers in which the power has been secured by simply turning the shaft and in which the operating handle is located in a fixed position with respect to the foot rest.

fore I donot wish to be limited to all the details of construction. herein shown and described but 'what I do claim is 1. In a boring device, the eombinationo'f a frame having a nut, a threaded shaft mounted in said nut and supportedthereby and provided .With means .for holding an anger at its end, a casing supported by said shaft at theother endiadapted ,to'be, turned independently of said; frame, and gearing carried ,by v said casing and connected With said. shaft. forpperating it,

2.111 a boring device,- the combination of a frame having a split-nut, a vertical threaded shaftrotatable in said nut and-supported thereby and providedfiwith means, for .holding Etnaugerat its bottom, a casingsupportedwby. said shaft at the ;top, gearing {on said .casing connected with said shaft for operatin'git, and a-handlefixed'on the casing fonpreventing its-rotation. V I

v3, Ina gboringdevice, the combinationof a frame having as split-nut, a threaded. shaft rotatable in. said nut. and. supported thereby and provided with means for holding ,an

anger at its end, a casing supported by the I other ,end; )f; sa d shait gearmg on sa1d casing connected with said shaft for operating it', aahribz-hztving a ball-race provided With bearing-balls mounted on the end of the shaft -a easing resting on said bearing-balls, I a gear insaid casingfixed to the end of the shaft, multiplying gearing carried by said casing, and a handle connected therewith for operating the shaft. V

' A. In a fioorauger, the combination of an upright frame provided with a horizontal prqeeting. foot-rest at the b0tto1n,a, g1iide near the,top,-,a split nutmounted on said gnide, ,an auger shaft supported by said In testimony whereof I have-hereunto afjfixed' my signature.

TJQHN JQBRO SNAN.

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